I set a Yeelight RGBW bulb for my cats before I leave the town. When my friend came to feed my cats he accidently turn off my wifi modem and after a while When I realised something is wrong and ask hım to check he turn it on again.

Eventhough modem is on again my bulb's status didn't change. Is there anything to do? What is the reason of this problem and are there any solution?